Google has proven itself as a company capable of, and prepared to move into new markets and to diversify its portfolio of services. Twitter, on the other hand, has only diversified around the 140 character concept.

In my mind, it is diversification that allows a tech company to stay afloat when new entrants can have such a rapid impact on the market.

It is in no way conceivable to me that the 'trendy' means to communicate will still be in 140 character morsels 10 years from now.